Tooleem
TextThis tool runs in your browser. No files or text are sent to our servers.

JSON Formatter

Format, minify, and validate JSON in your browser. Paste JSON to pretty-print or compact it, and see errors instantly.

Formatted JSON
{
  "name": "Tooleem",
  "tools": 24,
  "live": true,
  "categories": [
    "images",
    "text"
  ]
}
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A JSON formatter for tidying, compacting, and validating JSON right in your browser. Paste JSON and get it back neatly indented and easy to read, or minified to a single line to save space. If the JSON is invalid, the tool shows the parser error so you can find the problem. Handy for developers, working with APIs, and reading config files. Everything runs locally, with nothing sent to a server.

01

How to use this tool

  1. 01Paste your JSONPaste the JSON into the input box. It can come from an API response, a config file, or any source.
  2. 02Choose Format or MinifyThe Format tab indents the JSON for readability. The Minify tab compacts it to a single line.
  3. 03Copy the resultIf the JSON is valid, you get output ready to copy. If there is an error, a message helps you locate it.
02

When is this useful?

  • Read an API responseYou get compact JSON back from an API and want to read it comfortably. Formatting lays it out with clear indentation.
  • Validate JSONNot sure the JSON is valid? The tool shows immediately if there is an error and points you toward the problem.
  • Minify before sendingCompact JSON to a single line to save space in a config file, a request, or storage.
03

Examples

  • Format compact JSONPaste a one-line object and choose Format to get it laid out with two-space indentation.
  • Minify formatted JSONPaste indented JSON and choose Minify to get it on a single line with no extra spaces.
  • Catch an errorIf a comma or quote is missing, the tool shows an error message instead of output, so you know what to fix.
04

Tips for a better result

  • Double quotes onlyThe JSON standard requires double quotes around keys and strings. Single quotes will cause an error.
  • No trailing commaA comma after the last item in an array or object is not valid JSON and will produce an error.
  • Unicode is preservedNon-Latin keys and values are kept intact and encoded correctly in both Format and Minify.

  • Format vs minify

    Formatting (pretty print) adds indentation and line breaks so the JSON is easy to read and edit, which is useful during development and debugging. Minifying removes all unnecessary whitespace and leaves one compact line, useful for storing and sending when you want a small file. Both keep exactly the same data and only change the formatting.

  • Validation

    The tool parses the JSON using the browser's own engine. If the structure is valid, you get output. If not, it shows the error as the browser reports it, to help you find where a comma, quote, or bracket is missing.

  • Privacy

    Processing happens only in your browser. No JSON is sent to a server and nothing is stored on our side.

05

Frequently asked questions

Is my JSON sent to a server?

No. All formatting, minifying, and validation happen in your browser, with nothing sent anywhere.

What is the difference between format and minify?

Formatting lays out the JSON with indentation for easy reading. Minifying removes whitespace and leaves one compact line. The data is identical; only the formatting differs.

Does it validate JSON?

Yes. If the JSON is invalid, instead of output you get an error message explaining what is wrong, to help you find the problem.

Is key order preserved?

Yes. Keys keep the order they appear in, in both Format and Minify. The tool does not reorder or sort them.

Why am I getting an error?

Common causes are single quotes instead of double quotes, a trailing comma after the last item, or a missing bracket. Fix it and the result appears.

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